VUV Excited Luminescence of LnZr(BO3)2∶Eu3+(Ln=Ba, Sr)
SHEN Fang1, HE Da-wei1*, LIU Hong-li1, XU Jian-hua2
1. Laboratory of Material for Information Storage and Display, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China 2. Laboratory of Beijing Synchrotron Radiation, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China
Abstract：Powder samples of Ba(1-x)SrxZr(BO3)2∶Eu3+(0≤x≤1) were prepared by the conventional solid state reaction method. The excitation spectrum shows a strong absorption in the VUV region with the broad absorption band edge at 130-170 nm due to the host and the f→d transition of Eu3+, and another absorption band of charge-transfer state (CTS) of Eu3+ in the region of 230 nm. The absorption of the charge-transfer band of Eu3+ can be increased by incorporating Al3+ ion into Zr4+ ion lattice. The luminescence of Ba(1-x)SrxZr(BO3)2∶Eu3+ is also increased by incorporating Al3+ into the lattices. In Ba(1-x)SrxZr(BO3)2∶Eu3+, the intensity of the absorption band (130-170 nm) decreases, and the band shifts about 30 nm toward lower energy with x increasing. The emission spectra revealed an intense and sharp (616 nm) red color emission from Eu 3+(5D0→7F2) transition under 147 nm VUV excitation.
Key words：Borate;VUV;Excitation spectra;Emission spectra;Energy transfer
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